/
file_config.rs
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/
file_config.rs
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#![allow(missing_docs)]
use std::{collections::HashMap, fs, path::Path};
use crate::{config::utils, error::ConfigError, Result};
use serde::{Deserialize, Serialize};
/// [`Kubeconfig`] represents information on how to connect to a remote Kubernetes cluster
/// that is normally stored in `~/.kube/config`
///
/// This type (and its children) are exposed for convenience only.
/// Please load a [`Config`][crate::Config] object for use with a [`Client`][crate::Client]
/// which will read and parse the kubeconfig file
#[derive(Clone, Debug, Serialize, Deserialize, Default)]
pub struct Kubeconfig {
pub kind: Option<String>,
#[serde(rename = "apiVersion")]
pub api_version: Option<String>,
pub preferences: Option<Preferences>,
pub clusters: Vec<NamedCluster>,
#[serde(rename = "users")]
pub auth_infos: Vec<NamedAuthInfo>,
pub contexts: Vec<NamedContext>,
#[serde(rename = "current-context")]
pub current_context: Option<String>,
pub extensions: Option<Vec<NamedExtension>>,
}
/// Preferences stores extensions for cli.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct Preferences {
pub colors: Option<bool>,
pub extensions: Option<Vec<NamedExtension>>,
}
/// NamedExtention associates name with extension.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct NamedExtension {
pub name: String,
pub extension: serde_json::Value,
}
/// NamedCluster associates name with cluster.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct NamedCluster {
pub name: String,
pub cluster: Cluster,
}
/// Cluster stores information to connect Kubernetes cluster.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct Cluster {
pub server: String,
#[serde(rename = "insecure-skip-tls-verify")]
pub insecure_skip_tls_verify: Option<bool>,
#[serde(rename = "certificate-authority")]
pub certificate_authority: Option<String>,
#[serde(rename = "certificate-authority-data")]
pub certificate_authority_data: Option<String>,
pub extensions: Option<Vec<NamedExtension>>,
}
/// NamedAuthInfo associates name with authentication.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct NamedAuthInfo {
pub name: String,
#[serde(rename = "user")]
pub auth_info: AuthInfo,
}
/// AuthInfo stores information to tell cluster who you are.
#[derive(Clone, Debug, Serialize, Deserialize, Default)]
pub struct AuthInfo {
pub username: Option<String>,
pub password: Option<String>,
pub token: Option<String>,
#[serde(rename = "tokenFile")]
pub token_file: Option<String>,
#[serde(rename = "client-certificate")]
pub client_certificate: Option<String>,
#[serde(rename = "client-certificate-data")]
pub client_certificate_data: Option<String>,
#[serde(rename = "client-key")]
pub client_key: Option<String>,
#[serde(rename = "client-key-data")]
pub client_key_data: Option<String>,
#[serde(rename = "as")]
pub impersonate: Option<String>,
#[serde(rename = "as-groups")]
pub impersonate_groups: Option<Vec<String>>,
#[serde(rename = "auth-provider")]
pub auth_provider: Option<AuthProviderConfig>,
pub exec: Option<ExecConfig>,
}
/// AuthProviderConfig stores auth for specified cloud provider.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct AuthProviderConfig {
pub name: String,
pub config: HashMap<String, String>,
}
/// ExecConfig stores credential-plugin configuration.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct ExecConfig {
#[serde(rename = "apiVersion")]
pub api_version: Option<String>,
pub args: Option<Vec<String>>,
pub command: String,
pub env: Option<Vec<HashMap<String, String>>>,
}
/// NamedContext associates name with context.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct NamedContext {
pub name: String,
pub context: Context,
}
/// Context stores tuple of cluster and user information.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct Context {
pub cluster: String,
pub user: String,
pub namespace: Option<String>,
pub extensions: Option<Vec<NamedExtension>>,
}
const KUBECONFIG: &str = "KUBECONFIG";
/// Some helpers on the raw Config object are exposed for people needing to parse it
impl Kubeconfig {
/// Read a Config from an arbitrary location
pub fn read_from<P: AsRef<Path>>(path: P) -> Result<Kubeconfig> {
let data = fs::read_to_string(&path).map_err(|source| ConfigError::ReadFile {
path: path.as_ref().into(),
source,
})?;
// support multiple documents
let mut documents: Vec<Kubeconfig> = vec![];
for doc in serde_yaml::Deserializer::from_str(&data) {
let value = serde_yaml::Value::deserialize(doc).map_err(ConfigError::ParseYaml)?;
let kconf = serde_yaml::from_value(value).map_err(ConfigError::ParseYaml)?;
documents.push(kconf)
}
// Remap all files we read to absolute paths.
let mut merged_docs = None;
for mut config in documents {
if let Some(dir) = path.as_ref().parent() {
for named in config.clusters.iter_mut() {
if let Some(path) = &named.cluster.certificate_authority {
if let Some(abs_path) = to_absolute(dir, path) {
named.cluster.certificate_authority = Some(abs_path);
}
}
}
for named in config.auth_infos.iter_mut() {
if let Some(path) = &named.auth_info.client_certificate {
if let Some(abs_path) = to_absolute(dir, path) {
named.auth_info.client_certificate = Some(abs_path);
}
}
if let Some(path) = &named.auth_info.client_key {
if let Some(abs_path) = to_absolute(dir, path) {
named.auth_info.client_key = Some(abs_path);
}
}
if let Some(path) = &named.auth_info.token_file {
if let Some(abs_path) = to_absolute(dir, path) {
named.auth_info.token_file = Some(abs_path);
}
}
}
}
if let Some(c) = merged_docs {
merged_docs = Some(Kubeconfig::merge(c, config)?);
} else {
merged_docs = Some(config);
}
}
Ok(merged_docs.expect("Need at least one yaml document in KUBECONFIG file"))
}
/// Read a Config from `KUBECONFIG` or the the default location.
pub fn read() -> Result<Kubeconfig> {
match Self::from_env()? {
Some(config) => Ok(config),
None => {
let path = utils::default_kube_path().ok_or(ConfigError::NoKubeconfigPath)?;
Self::read_from(path)
}
}
}
/// Create `Kubeconfig` from `KUBECONFIG` environment variable.
/// Supports list of files to be merged.
///
/// # Panics
///
/// Panics if `KUBECONFIG` value contains the NUL character.
pub fn from_env() -> Result<Option<Self>> {
match std::env::var_os(KUBECONFIG) {
Some(value) => {
let paths = std::env::split_paths(&value)
.filter(|p| !p.as_os_str().is_empty())
.collect::<Vec<_>>();
if paths.is_empty() {
return Ok(None);
}
let merged = paths.iter().try_fold(Kubeconfig::default(), |m, p| {
Kubeconfig::read_from(p).and_then(|c| m.merge(c))
})?;
Ok(Some(merged))
}
None => Ok(None),
}
}
/// Merge kubeconfig file according to the rules described in
/// <https://kubernetes.io/docs/concepts/configuration/organize-cluster-access-kubeconfig/#merging-kubeconfig-files>
///
/// > Merge the files listed in the `KUBECONFIG` environment variable according to these rules:
/// >
/// > - Ignore empty filenames.
/// > - Produce errors for files with content that cannot be deserialized.
/// > - The first file to set a particular value or map key wins.
/// > - Never change the value or map key.
/// > Example: Preserve the context of the first file to set `current-context`.
/// > Example: If two files specify a `red-user`, use only values from the first file's `red-user`.
/// > Even if the second file has non-conflicting entries under `red-user`, discard them.
fn merge(mut self, next: Kubeconfig) -> Result<Self> {
if self.kind.is_some() && next.kind.is_some() && self.kind != next.kind {
return Err(ConfigError::KindMismatch.into());
}
if self.api_version.is_some() && next.api_version.is_some() && self.api_version != next.api_version {
return Err(ConfigError::ApiVersionMismatch.into());
}
self.kind = self.kind.or(next.kind);
self.api_version = self.api_version.or(next.api_version);
self.preferences = self.preferences.or(next.preferences);
append_new_named(&mut self.clusters, next.clusters, |x| &x.name);
append_new_named(&mut self.auth_infos, next.auth_infos, |x| &x.name);
append_new_named(&mut self.contexts, next.contexts, |x| &x.name);
self.current_context = self.current_context.or(next.current_context);
self.extensions = self.extensions.or(next.extensions);
Ok(self)
}
}
fn append_new_named<T, F>(base: &mut Vec<T>, next: Vec<T>, f: F)
where
F: Fn(&T) -> &String,
{
use std::collections::HashSet;
base.extend({
let existing = base.iter().map(|x| f(x)).collect::<HashSet<_>>();
next.into_iter()
.filter(|x| !existing.contains(f(x)))
.collect::<Vec<_>>()
});
}
fn to_absolute(dir: &Path, file: &str) -> Option<String> {
let path = Path::new(&file);
if path.is_relative() {
dir.join(path).to_str().map(str::to_owned)
} else {
None
}
}
impl Cluster {
pub(crate) fn load_certificate_authority(&self) -> Result<Option<Vec<u8>>> {
if self.certificate_authority.is_none() && self.certificate_authority_data.is_none() {
return Ok(None);
}
let res =
utils::data_or_file_with_base64(&self.certificate_authority_data, &self.certificate_authority)?;
Ok(Some(res))
}
}
impl AuthInfo {
pub(crate) fn load_client_certificate(&self) -> Result<Vec<u8>> {
utils::data_or_file_with_base64(&self.client_certificate_data, &self.client_certificate)
}
pub(crate) fn load_client_key(&self) -> Result<Vec<u8>> {
utils::data_or_file_with_base64(&self.client_key_data, &self.client_key)
}
}
#[cfg(test)]
mod tests {
use super::*;
use serde_json::Value;
#[test]
fn kubeconfig_merge() {
let kubeconfig1 = Kubeconfig {
current_context: Some("default".into()),
auth_infos: vec![NamedAuthInfo {
name: "red-user".into(),
auth_info: AuthInfo {
token: Some("first-token".into()),
..Default::default()
},
}],
..Default::default()
};
let kubeconfig2 = Kubeconfig {
current_context: Some("dev".into()),
auth_infos: vec![
NamedAuthInfo {
name: "red-user".into(),
auth_info: AuthInfo {
token: Some("second-token".into()),
username: Some("red-user".into()),
..Default::default()
},
},
NamedAuthInfo {
name: "green-user".into(),
auth_info: AuthInfo {
token: Some("new-token".into()),
..Default::default()
},
},
],
..Default::default()
};
let merged = kubeconfig1.merge(kubeconfig2).unwrap();
// Preserves first `current_context`
assert_eq!(merged.current_context, Some("default".into()));
// Auth info with the same name does not overwrite
assert_eq!(merged.auth_infos[0].name, "red-user".to_owned());
assert_eq!(merged.auth_infos[0].auth_info.token, Some("first-token".into()));
// Even if it's not conflicting
assert_eq!(merged.auth_infos[0].auth_info.username, None);
// New named auth info is appended
assert_eq!(merged.auth_infos[1].name, "green-user".to_owned());
}
#[test]
fn kubeconfig_deserialize() {
let config_yaml = "apiVersion: v1
clusters:
- cluster:
certificate-authority-data: LS0t<SNIP>LS0tLQo=
server: https://ABCDEF0123456789.gr7.us-west-2.eks.amazonaws.com
name: eks
- cluster:
certificate-authority: /home/kevin/.minikube/ca.crt
extensions:
- extension:
last-update: Thu, 18 Feb 2021 16:59:26 PST
provider: minikube.sigs.k8s.io
version: v1.17.1
name: cluster_info
server: https://192.168.49.2:8443
name: minikube
contexts:
- context:
cluster: minikube
extensions:
- extension:
last-update: Thu, 18 Feb 2021 16:59:26 PST
provider: minikube.sigs.k8s.io
version: v1.17.1
name: context_info
namespace: default
user: minikube
name: minikube
- context:
cluster: arn:aws:eks:us-west-2:012345678912:cluster/eks
user: arn:aws:eks:us-west-2:012345678912:cluster/eks
name: eks
current-context: minikube
kind: Config
preferences: {}
users:
- name: arn:aws:eks:us-west-2:012345678912:cluster/eks
user:
exec:
apiVersion: client.authentication.k8s.io/v1alpha1
args:
- --region
- us-west-2
- eks
- get-token
- --cluster-name
- eks
command: aws
env: null
provideClusterInfo: false
- name: minikube
user:
client-certificate: /home/kevin/.minikube/profiles/minikube/client.crt
client-key: /home/kevin/.minikube/profiles/minikube/client.key";
let config: Kubeconfig = serde_yaml::from_str(config_yaml)
.map_err(ConfigError::ParseYaml)
.unwrap();
assert_eq!(config.clusters[0].name, "eks");
assert_eq!(config.clusters[1].name, "minikube");
assert_eq!(
config.clusters[1].cluster.extensions.as_ref().unwrap()[0]
.extension
.get("provider"),
Some(&Value::String("minikube.sigs.k8s.io".to_owned()))
);
}
}